A classic lesson in strategy: Aerts was unable to deny Overeem access to the pocket. It was as obvious at that. Averts, the outside fighter, allowed" Overeem to enter the pocket AND to "walk" him to the ropes. Against a pressure fighter... like Overeem who is going to "squeeze" (cut the ring off) you, one must NEVER move straight backwards---and especially into the ropes where you become trapped.
I liked Overeem's head rhythm (partial side to side slipping, the same as exercised by Mike Tyson) he used to enter the pocket to avoid getting hit----masterful.

1) A fighter's greatest strength is "the authority of his will." You can read Aerts' attitude even before the bell, his willingness to engage was NOT there. He was not prepared to "take control" at the sound of the bell to dictate the momentum. One MUST take control of the lead off game or the countering game---he allowed his opponent (Overeem) to have both.

2) Aerts "must" use the jab to keep his opponent out of the pocket in order to protect his chin. Aerts failed to DENY his opponent access to the pocket. Against a slugger/pressure type fighter, you must sharp-shoot and keep him out of the pocket.

3) A slugger/pressure fighter does not take the time to set up his punches or attacks. They just position, set, and fire. Against this type of opponent, you MUST therefore keep him out of the pocket and "not" give him that position (allowing him to get set). This forces him to WORK in order to get set up to fire anything, be it a kick or a punch.

The RULE: Do everything in your power to deny opponent access to the pocket.

4) Aerts "must" keep the distance in order to make his opponent LEAN FORWARD (lean into you) when attempting to bridge the gap. This keeps him off balance, opens up his chin, and can help prevent opponent from using head rhythm to avoid getting hit coming in (as did Aerts' opponent during this fight). Joe Lewis